Eduard Shishkin b94566048b zipl/src: Introduce 'write simulation' mode for individual files ...

Introduce a write simulation operation, which doesn't write actual
data and just updates the current position in the file.
This allows to emulate block lists for files located on raw devices
(not formatted with a file system). This is used by the next patches
in the series to implement '--dry-run' zipl option for dumps of all
types (not only ngdumps).

Introduce a 'misc file descriptor', which allows to mark individual
files as "opened in a simulation mode".

Whenever bulding a bootmap file, use either real write, or write
simulation depending on the mode set in the 'misc file descriptor'.

Tested-by: Mikhail Zaslonko <zaslonko@linux.ibm.com>
Reviewed-by: Mikhail Zaslonko <zaslonko@linux.ibm.com>
Signed-off-by: Eduard Shishkin <edward6@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>

2025-04-07 17:42:18 +02:00

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